SubLocal - Subtitle Generator

SubLocal — Offline Subtitle Generator

Generate and translate subtitles for your videos and audio files directly on your device. SubLocal does not upload your media or subtitle text for processing. AI models are downloaded only when you request them; transcription and translation then work offline.

Extract audio from video and export it as an M4A file, or export subtitles as SRT, ASS, VTT, or TXT. You can optionally keep the source media in the app's private storage, then play and practice individual subtitle lines from History.

Key Features:

• Offline AI subtitle generator — no upload, 100% private

• Free unlimited on-device subtitle translation

• Subtitle maker for video and audio (MP4, MKV, MOV, MP3, WAV and more)

• Extract audio from video and export as M4A (video to audio)

• Export SRT, ASS, VTT, or TXT as original, translated, or bilingual subtitles

• Real-time subtitle playback with highlighting

• History for all your transcriptions

• Optional private media retention for playback and practice from History

• Line-by-line playback with speed, repeat, and pause controls

• Multiple AI models for different languages

Supported Languages:

Chinese, English, Japanese, Korean, Cantonese, French, Spanish, German, Italian, Portuguese, Russian, Greek

How to use:

1. Pick a video or audio file

2. Choose language and AI model

3. Tap Generate — subtitles are created on your device

4. Translate if needed, then export subtitles or extract audio

5. Optionally keep the media to play and practice subtitle lines from History

Media processing, transcription, translation, and practice playback are local. Retained media is optional and stored only in the app's private storage. Model downloads require internet access, but they do not include your media or subtitle content. Files leave the app only when you explicitly share or export them to another destination. No account required. Free to use.